/*
* Copyright (c) 2025 Huawei Device Co., Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including but not limited to the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to provide persons with access to the Software
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGE OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/

import { BreakpointManager } from '../../hooks/breakpoint';

/**
 * @description 基于web components实现类挪移布局组件子标签
 */
export class DiversionItemComponent extends HTMLElement {
  private _property: string[];
  private _styleElement: HTMLStyleElement | null;
  private _unsubscribeBreakpoint: () => void;
  readonly DEFAULT_COLS = 12;

  constructor() {
    super();
    this._styleElement = null;
    this._property = ['scope', 'name', 'diversion-cols', 'diversion-gap'];
    const breakpoint = new BreakpointManager();
    this._unsubscribeBreakpoint = breakpoint.subscribeToBreakpoint(() => {
      this._attachStyles();
    })
  }

  connectedCallback(): void {
    this._attachStyles();
  }

  disconnectedCallback(): void {
    this._unsubscribeBreakpoint();
  }

  static get observedAttributes(): string[] {
    return ['scope', 'name', 'diversion-cols', 'diversion-gap'];
  }

  attributeChangedCallback(name: string): void {
    if (this._property.includes(name)) {
      this._attachStyles();
    }
  }

  private _propertyProcess(attribute: string | null, defaultValue: number): number {
    if (attribute === null) {
      return defaultValue;
    }
    return isNaN(parseInt(attribute as string)) ? defaultValue : parseInt(attribute as string);
  }

  private _attachStyles(): void {
    if (this._styleElement) {
      this._styleElement.remove();
    }

    const span = this._propertyProcess(this.getAttribute('diversion-cols'), this.DEFAULT_COLS);
    const offset = this._propertyProcess(this.getAttribute('diversion-gap'), 0) / 2;
    const diversionRatio = (span / this.DEFAULT_COLS * 100).toFixed(4);
    const scopeId = this.getAttribute('scope') || '';
    const style = document.createElement('style') as HTMLStyleElement;
    style.textContent = `
      .${scopeId} {
        width: ${diversionRatio}%;
        padding-left: ${offset}px;
        padding-right: ${offset}px;
        box-sizing: border-box;
      }
    `;

    this._styleElement = style;
    document.head.appendChild(style);
  }
}

if (!customElements.get('multi-diversion-item')) {
  customElements.define('multi-diversion-item', DiversionItemComponent);
}